we were maybe halfway up the road when heather turned to me and said did you happen to notice that brown van? and i said no. >> then the van passed again slowly. >> we still weren't alarm. he came by again a third time. yep, really slow that time. he stared at us. the hair on the back of our necks stood up. >> he pulled up beside us. >> his wheels were on the side of the curb. he leaned over and started to say something. at that point we're both like run, just run. >> the girls called security, describing a two-tone van driven by a man with mutton chop side burns. they questioned the man named larry hall. hall said he was looking for a friend's address, but the address he gave didn't exist. so officers let paul go. september 20, 1993, six months after tricia's disappearance, now 15-year-old jessica roach goes missing in georgetown, illinois. investigator gary miller got the call. >> we all knew that we had something really bad here. we had an abduction. >> jessica's badly decomposed body was found in an indiana corn field weeks later. but then like tricia's, jessica's case went cold. >>